Rinnai HE Series How To Use Manual page 158

Code 10 Troubleshooting Procedure
Air Supply or Exhaust Blockage
Request pictures of the entire vent system inside/outside the home or business. Review pictures looking
for clearance issues, improper venting or materials used, etc. File all pictures in Syteline under incident
number.
1. Perform this test only if the unit is coding out during your service call. Remove the vent system from
the top of the water heater. Fire the product and see if the unit will operate without the vent system
connected. If the unit operates without coding out at that point that's a great indication the problem is
in the vent system leaving the unit. Ensure the front cover is installed on product before performing this
test. Never leave a unit operating without the vent system connected. The test mentioned above is only
that, a test. If the unit functioned with the vent disconnected there is a 95% chance the issue is in the
vent pipe installation. Next go to step 2 below. There is a 5% chance it could be in the other items listed
below.
2. Verify each vent section for proper installation. This will require disassembling each section to ensure
proper installation depth. Mark vent pipe section with a marker before disassembling. This will allow
you to determine the proper depth when you disassemble the components. Make sure to use the
silicone grease Rinnai supplies with the condensing vent (PP) venting when installing each joint. Failure
to use the grease will result in improperly sealed joints which will lead to code 10.
3. Inspect the vent system to ensure all clearances around vent terminations were met. Improper
clearances will result in recirculation of combustion gases.
4. Make sure dip switch for vent length was set to the proper position. First determine total vent length,
each ninety degree elbow counts as six foot of vent length, and each forty five degree bend counts as
three foot. Example; a vent system with two ninety degree elbows, one forty five degree elbow and ten
foot of straight pipe would be calculated as twenty five foot of total vent length.
5. If installer sprayed a form sealant around the vent pipe penetration through the wall make sure this
material did not collapse the intake pipe. Look down vent pipe with a flash light. If you can't see that
section of venting material remove it from the wall and inspect it.
6. Check for debris in vent system. Disconnect joints looking for water, condensation, inspects or other
items.
7. Make sure vent termination meets Rinnai's recommendation from another vent termination on the
same wall. If multiple Rinnai's are installed at location each termination should have a minimum of
twelve inches of separation when installed on the same plane. If the other vents are not on the same
plane you need a five foot separation between vent terminations.
8. Verify vent terminals are installed with the proper clearance from overhangs, grade, obstructions,
walls, porches, etc. See venting instructions for proper clearance requirements.
9. Remove fan motor and inspect fan wheel, housing, and air duct for any type restriction.
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